Pub Date : 1900-01-01DOI: 10.1109/IRETAP.1956.6366300
H. A. Myers
This paper describes the radiation pattern of the un-symmetrically-fed prolate spheroidal transmitting antenna. Maxwell's equations are solved in prolate spheroidal coordinates subject to the boundary conditions. The prolate spheroidal functions are expressed in the form of power series and Laurent series. Radiation patterns have been obtained for antennas of three different lengths up to about one wavelength long, for length/thickness ratios of about 5/1, 10/1,22/1, and 316/1, and for nine unsymmetrical gap locations as well as for the symmetrically-fed cases. It was found that the two most important factors affecting the radiation pattern of a fairly thin antenna were the location of the gap and the electrical length. For antennas less than a half wavelength long, the pattern was the usual symmetrical figure eight and was essentially independent of the location of the gap (except for magnitude changes due to the different gap impedances). For antennas two-thirds to three-quarters of a wavelength long the figure eight patterns could be "bent" in the direction of the longer element, and for antennas one wavelength long or longer minor lobes began to appear.
{"title":"Radiation patterns of unsymmetrically fed prolate spheroidal antennas","authors":"H. A. Myers","doi":"10.1109/IRETAP.1956.6366300","DOIUrl":"https://doi.org/10.1109/IRETAP.1956.6366300","url":null,"abstract":"This paper describes the radiation pattern of the un-symmetrically-fed prolate spheroidal transmitting antenna. Maxwell's equations are solved in prolate spheroidal coordinates subject to the boundary conditions. The prolate spheroidal functions are expressed in the form of power series and Laurent series. Radiation patterns have been obtained for antennas of three different lengths up to about one wavelength long, for length/thickness ratios of about 5/1, 10/1,22/1, and 316/1, and for nine unsymmetrical gap locations as well as for the symmetrically-fed cases. It was found that the two most important factors affecting the radiation pattern of a fairly thin antenna were the location of the gap and the electrical length. For antennas less than a half wavelength long, the pattern was the usual symmetrical figure eight and was essentially independent of the location of the gap (except for magnitude changes due to the different gap impedances). For antennas two-thirds to three-quarters of a wavelength long the figure eight patterns could be \"bent\" in the direction of the longer element, and for antennas one wavelength long or longer minor lobes began to appear.","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128938065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/tap.1956.1144387
{"title":"Scattering, diffraction, and general mathematical papers","authors":"","doi":"10.1109/tap.1956.1144387","DOIUrl":"https://doi.org/10.1109/tap.1956.1144387","url":null,"abstract":"","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122439871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/tap.1956.1144385
{"title":"Ferrites, plasma oscillations, and anisotropic media","authors":"","doi":"10.1109/tap.1956.1144385","DOIUrl":"https://doi.org/10.1109/tap.1956.1144385","url":null,"abstract":"","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132964726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/IRETAP.1956.6366301
C. Polk
An equation for the on-axis gain of a uniformly illuminated rectangular aperture is derived which is valid in the "Optical Fresnel Zone." This equation is formulated in terms of the ordinary radiation field gain multiplied by a correction factor which depends upon the aperture dimensions and the distance, R, from the aperture at which the gain is measured. A table of the function [C2(v)+S(v)]/v2 is given; C(v) and S(v) being the Fresnel integrals. The gain of a square aperture (LXL meters) in the Fresnel-zone region is compared with the gain of a circular aperture and it is shown that for apertures of equal Gsquare < Gcircle when (L2/λ)
{"title":"Optical Fresnel-Zone gain of a rectangular aperture","authors":"C. Polk","doi":"10.1109/IRETAP.1956.6366301","DOIUrl":"https://doi.org/10.1109/IRETAP.1956.6366301","url":null,"abstract":"An equation for the on-axis gain of a uniformly illuminated rectangular aperture is derived which is valid in the \"Optical Fresnel Zone.\" This equation is formulated in terms of the ordinary radiation field gain multiplied by a correction factor which depends upon the aperture dimensions and the distance, R, from the aperture at which the gain is measured. A table of the function [C2(v)+S(v)]/v2 is given; C(v) and S(v) being the Fresnel integrals. The gain of a square aperture (LXL meters) in the Fresnel-zone region is compared with the gain of a circular aperture and it is shown that for apertures of equal Gsquare < Gcircle when (L2/λ) <R ≤(2L2 λ); it is also shown that Gsquare has minima, but not zeros at R=L2/7.30λ, R=L2/5.24λ. Furthermore it is shown that for RλL2/2λ the first order gain correction factor of a square aperture is equal to the gain correction factor of a circular aperture having a diameter equal to 1.208 times the sidelength of the square. An approximate formula for the Fresnel-zone gain of a long and narrow aperture is also given.","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131284938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/IRETAP.1956.6366306
A. Kay
THE DIFFICULTY of rapid scanning over the outer surface of a Luneberg lens has led Gutman1 to devise a lens in which the feed moves on a smaller radius. In Gutman's lens the feed horn points toward the center of the lens and the center section, which rotates during the scan, also serves as a focusing region. In some applications it would be desirable to point the feed horn outward and reserve this center section for rf components. The rotational torque required could also be reduced considerably thereby. We assume throughout that the lens must be radially symmetric to allow 360° of scan.
{"title":"The impossibility of certain desirable luneberg lens modifications","authors":"A. Kay","doi":"10.1109/IRETAP.1956.6366306","DOIUrl":"https://doi.org/10.1109/IRETAP.1956.6366306","url":null,"abstract":"THE DIFFICULTY of rapid scanning over the outer surface of a Luneberg lens has led Gutman1 to devise a lens in which the feed moves on a smaller radius. In Gutman's lens the feed horn points toward the center of the lens and the center section, which rotates during the scan, also serves as a focusing region. In some applications it would be desirable to point the feed horn outward and reserve this center section for rf components. The rotational torque required could also be reduced considerably thereby. We assume throughout that the lens must be radially symmetric to allow 360° of scan.","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114155968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/IRETAP.1956.6366299
A. Bystrom, D. G. Berntsen
This paper presents the results of an experimental investigation which led to the development of cavity-mounted helical antennas for airborne applications. The effects on patterns and impedance of various antenna parameters, such as number of turns, cavity size and shape, helix pitch, angle, and conductor size, were investigated. Methods of feeding the helix which produce an input impedance near 50 ohms, without external compensation, throughout the axial mode frequency range are discussed. Some of the types of cavity-mounted helices developed and typical performance data are described.
{"title":"An experimental investigation of cavity-mounted helical antennas","authors":"A. Bystrom, D. G. Berntsen","doi":"10.1109/IRETAP.1956.6366299","DOIUrl":"https://doi.org/10.1109/IRETAP.1956.6366299","url":null,"abstract":"This paper presents the results of an experimental investigation which led to the development of cavity-mounted helical antennas for airborne applications. The effects on patterns and impedance of various antenna parameters, such as number of turns, cavity size and shape, helix pitch, angle, and conductor size, were investigated. Methods of feeding the helix which produce an input impedance near 50 ohms, without external compensation, throughout the axial mode frequency range are discussed. Some of the types of cavity-mounted helices developed and typical performance data are described.","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130287593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/tap.1959.1144643
{"title":"Fall meeting of International Scientific Radio Union October 20-22, 1958, Pennsylvania State university","authors":"","doi":"10.1109/tap.1959.1144643","DOIUrl":"https://doi.org/10.1109/tap.1959.1144643","url":null,"abstract":"","PeriodicalId":133512,"journal":{"name":"IRE Transactions on Antennas and Propagation","volume":" 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132075650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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